SOLUTION: Hello, I am trying to figure out this word problem for my Algebra I class. So far, I think I have figured out the following, but am not sure how to put it together into a formula

Question 801042:
Hello, I am trying to figure out this word problem for my Algebra I class. So far, I think I have figured out the following, but am not sure how to put it together into a formula that works.
monthly income =x
rent=.30x
food=.25(x-90)

Peter spends 30% of his monthly income for rent and 25% for food. The amount spent for food is $90 less than the amount spent for rent. Find his monthly income.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
monthly income =x
rent=.30x
food=.25x
.25x = .30x - 90
add 90 to both sides of =
.25x +90 = .30x
subtract .25x from both sides of =
.05x = 90
x = $1800
monthly income is $1800

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